Researchers at EPFL have developed flexible, bat-like wings that generate more lift and improve flight performance compared to rigid wings. This innovation could lead to more efficient drones and energy harvesting technologies.
Researchers have designed flexible, bat-like wings that demonstrate enhanced lift and improved flight performance . This groundbreaking innovation holds the potential to revolutionize drone technology and energy harvesting methods. Inspired by the flight mechanics of insects and bats, scientists delved into the aerodynamic principles behind lift generation . In the 1930s, entomologist Antoine Magnan questioned the ability of bumblebees to fly due to their seemingly inadequate wing size.
Advanced high-speed camera technology later revealed the secret: the leading-edge vortex. This phenomenon occurs when air flowing around the leading edge of flapping wings rolls up into a vortex, creating a low-pressure region that significantly boosts lift.Bats, on the other hand, possess flexible membrane wings that enable them to achieve flight efficiency rivaling that of insects. Some bat species have been observed to expend up to 40% less energy compared to moths of similar size. Researchers at EPFL's School of Engineering, specifically at the Unsteady Flow Diagnostics Laboratory, embarked on a study to explore the aerodynamic advantages of more flexible wings. Utilizing an experimental platform featuring a highly deformable membrane constructed from a silicone-based polymer, they discovered that instead of generating a vortex, the air flows smoothly over the curved wings, resulting in increased lift and surpassing the performance of rigid wings of equivalent dimensions. Alexander Gehrke, a former EPFL student and current researcher at Brown University, explained, 'The key finding of this research is that the lift gain we observe stems not from a leading-edge vortex, but from the airflow following the gentle curvature of the membrane wing. Not only does the wing require a curved shape, but it needs to be curved to a precise degree; a wing that is too flexible will exhibit diminished performance.' The researchers attached the flexible membrane to a rigid frame with edges capable of rotating around their axes. To visualize the airflow around the wing, they immersed their device in water mixed with polystyrene tracer particles. Karen Mulleners, head of the Unsteady Flow Diagnostics Lab, stated, 'Our experiments enabled us to indirectly modify the front and back angles of the wing, allowing us to observe how they aligned with the flow. Due to the membrane's deformation, the flow was not forced to roll up into a vortex; instead, it followed the wing's curvature naturally without separating, thereby creating more lift.'Gehrke further emphasized the potential applications of this research, stating, 'We recognize that bats excel at hovering, and their deformable membrane wings play a crucial role. Understanding how wing deformation influences hovering performance is a significant question. However, conducting experiments on live animals presents considerable challenges. By employing a simplified bio-inspired experiment, we can gain insights into nature's fliers and develop more efficient aerial vehicles.' He explained that as drones miniaturize, they become increasingly susceptible to minor aerodynamic disturbances and unsteady gusts compared to larger aircraft. Conventional quadrotor drones cease to function effectively at very small scales, suggesting that adopting the flapping wing motions observed in animals could lead to improved versions of these flyers capable of hovering and carrying payloads more efficiently. The team's findings could also be instrumental in enhancing existing energy technologies like wind turbines or commercializing emerging systems like tidal harvesters that passively capture energy from ocean currents.Advances in sensor and control technology, potentially combined with artificial intelligence, could facilitate the precise regulation required to control the deformation of flexible membrane wings and adapt the performance of such flyers to varying weather conditions or flight missions
Aerodynamics Bat Wings Drones Energy Harvesting Flight Performance Flexible Wings Lift Generation
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